linux-stable/net/l2tp
Michael Weiß 2abe05234f l2tp: Allow management of tunnels and session in user namespace
Creation and management of L2TPv3 tunnels and session through netlink
requires CAP_NET_ADMIN. However, a process with CAP_NET_ADMIN in a
non-initial user namespace gets an EPERM due to the use of the
genetlink GENL_ADMIN_PERM flag. Thus, management of L2TP VPNs inside
an unprivileged container won't work.

We replaced the GENL_ADMIN_PERM by the GENL_UNS_ADMIN_PERM flag
similar to other network modules which also had this problem, e.g.,
openvswitch (commit 4a92602aa1 "openvswitch: allow management from
inside user namespaces") and nl80211 (commit 5617c6cd6f "nl80211:
Allow privileged operations from user namespaces").

I tested this in the container runtime trustm3 (trustm3.github.io)
and was able to create l2tp tunnels and sessions in unpriviliged
(user namespaced) containers using a private network namespace.
For other runtimes such as docker or lxc this should work, too.

Signed-off-by: Michael Weiß <michael.weiss@aisec.fraunhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-04-08 14:30:46 -07:00
..
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
l2tp_core.c l2tp: Allow duplicate session creation with UDP 2020-02-04 12:35:49 +01:00
l2tp_core.h l2tp: Replace zero-length array with flexible-array member 2020-02-28 12:08:37 -08:00
l2tp_debugfs.c l2tp: no need to check return value of debugfs_create functions 2019-06-14 08:45:05 -07:00
l2tp_eth.c net: core: add generic lockdep keys 2019-10-24 14:53:48 -07:00
l2tp_ip.c netfilter: drop bridge nf reset from nf_reset 2019-10-01 18:42:15 +02:00
l2tp_ip6.c net: ipv6: add net argument to ip6_dst_lookup_flow 2019-12-04 12:27:12 -08:00
l2tp_netlink.c l2tp: Allow management of tunnels and session in user namespace 2020-04-08 14:30:46 -07:00
l2tp_ppp.c compat_ioctl: pppoe: fix PPPOEIOCSFWD handling 2019-07-30 14:42:13 -07:00
Makefile